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samba-mirror/source3/smbd/smb2_negprot.c
2012-08-17 14:51:57 +02:00

383 lines
10 KiB
C

/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/smb/smb_common.h"
#include "../lib/tsocket/tsocket.h"
#include "../librpc/ndr/libndr.h"
/*
* this is the entry point if SMB2 is selected via
* the SMB negprot and the given dialect.
*/
static void reply_smb20xx(struct smb_request *req, uint16_t dialect)
{
uint8_t *smb2_inbuf;
uint8_t *smb2_hdr;
uint8_t *smb2_body;
uint8_t *smb2_dyn;
size_t len = 4 + SMB2_HDR_BODY + 0x24 + 2;
smb2_inbuf = talloc_zero_array(talloc_tos(), uint8_t, len);
if (smb2_inbuf == NULL) {
DEBUG(0, ("Could not push spnego blob\n"));
reply_nterror(req, NT_STATUS_NO_MEMORY);
return;
}
smb2_hdr = smb2_inbuf + 4;
smb2_body = smb2_hdr + SMB2_HDR_BODY;
smb2_dyn = smb2_body + 0x24;
SIVAL(smb2_hdr, SMB2_HDR_PROTOCOL_ID, SMB2_MAGIC);
SIVAL(smb2_hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY);
SSVAL(smb2_body, 0x00, 0x0024); /* struct size */
SSVAL(smb2_body, 0x02, 0x0001); /* dialect count */
SSVAL(smb2_dyn, 0x00, dialect);
req->outbuf = NULL;
smbd_smb2_first_negprot(req->sconn, smb2_inbuf, len);
return;
}
/*
* this is the entry point if SMB2 is selected via
* the SMB negprot and the "SMB 2.002" dialect.
*/
void reply_smb2002(struct smb_request *req, uint16_t choice)
{
reply_smb20xx(req, SMB2_DIALECT_REVISION_202);
}
/*
* this is the entry point if SMB2 is selected via
* the SMB negprot and the "SMB 2.???" dialect.
*/
void reply_smb20ff(struct smb_request *req, uint16_t choice)
{
req->sconn->smb2.negprot_2ff = true;
reply_smb20xx(req, SMB2_DIALECT_REVISION_2FF);
}
NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req)
{
NTSTATUS status;
const uint8_t *inbody;
const uint8_t *indyn = NULL;
DATA_BLOB outbody;
DATA_BLOB outdyn;
DATA_BLOB negprot_spnego_blob;
uint16_t security_offset;
DATA_BLOB security_buffer;
size_t expected_dyn_size = 0;
size_t c;
uint16_t security_mode;
uint16_t dialect_count;
uint16_t in_security_mode;
uint32_t in_capabilities;
DATA_BLOB in_guid_blob;
struct GUID in_guid;
uint16_t dialect = 0;
uint32_t capabilities;
DATA_BLOB out_guid_blob;
struct GUID out_guid;
enum protocol_types protocol = PROTOCOL_NONE;
uint32_t max_limit;
uint32_t max_trans = lp_smb2_max_trans();
uint32_t max_read = lp_smb2_max_read();
uint32_t max_write = lp_smb2_max_write();
NTTIME now = timeval_to_nttime(&req->request_time);
status = smbd_smb2_request_verify_sizes(req, 0x24);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
inbody = SMBD_SMB2_IN_BODY_PTR(req);
dialect_count = SVAL(inbody, 0x02);
in_security_mode = SVAL(inbody, 0x04);
in_capabilities = IVAL(inbody, 0x08);
in_guid_blob = data_blob_const(inbody + 0x0C, 16);
if (dialect_count == 0) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
status = GUID_from_ndr_blob(&in_guid_blob, &in_guid);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
expected_dyn_size = dialect_count * 2;
if (SMBD_SMB2_IN_DYN_LEN(req) < expected_dyn_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
indyn = SMBD_SMB2_IN_DYN_PTR(req);
for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
if (lp_srv_maxprotocol() < PROTOCOL_SMB3_00) {
break;
}
if (lp_srv_minprotocol() > PROTOCOL_SMB3_00) {
break;
}
dialect = SVAL(indyn, c*2);
if (dialect == SMB3_DIALECT_REVISION_300) {
protocol = PROTOCOL_SMB3_00;
break;
}
}
for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
if (lp_srv_maxprotocol() < PROTOCOL_SMB2_24) {
break;
}
if (lp_srv_minprotocol() > PROTOCOL_SMB2_24) {
break;
}
dialect = SVAL(indyn, c*2);
if (dialect == SMB2_DIALECT_REVISION_224) {
protocol = PROTOCOL_SMB2_24;
break;
}
}
for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
if (lp_srv_maxprotocol() < PROTOCOL_SMB2_22) {
break;
}
if (lp_srv_minprotocol() > PROTOCOL_SMB2_22) {
break;
}
dialect = SVAL(indyn, c*2);
if (dialect == SMB2_DIALECT_REVISION_222) {
protocol = PROTOCOL_SMB2_22;
break;
}
}
for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
if (lp_srv_maxprotocol() < PROTOCOL_SMB2_10) {
break;
}
if (lp_srv_minprotocol() > PROTOCOL_SMB2_10) {
break;
}
dialect = SVAL(indyn, c*2);
if (dialect == SMB2_DIALECT_REVISION_210) {
protocol = PROTOCOL_SMB2_10;
break;
}
}
for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
if (lp_srv_maxprotocol() < PROTOCOL_SMB2_02) {
break;
}
if (lp_srv_minprotocol() > PROTOCOL_SMB2_02) {
break;
}
dialect = SVAL(indyn, c*2);
if (dialect == SMB2_DIALECT_REVISION_202) {
protocol = PROTOCOL_SMB2_02;
break;
}
}
for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) {
if (lp_srv_maxprotocol() < PROTOCOL_SMB2_10) {
break;
}
dialect = SVAL(indyn, c*2);
if (dialect == SMB2_DIALECT_REVISION_2FF) {
if (req->sconn->smb2.negprot_2ff) {
req->sconn->smb2.negprot_2ff = false;
protocol = PROTOCOL_SMB2_10;
break;
}
}
}
if (protocol == PROTOCOL_NONE) {
return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED);
}
if (get_remote_arch() != RA_SAMBA) {
set_remote_arch(RA_VISTA);
}
/* negprot_spnego() returns a the server guid in the first 16 bytes */
negprot_spnego_blob = negprot_spnego(req, req->sconn);
if (negprot_spnego_blob.data == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
if (negprot_spnego_blob.length < 16) {
return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR);
}
security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED;
if (lp_server_signing() == SMB_SIGNING_REQUIRED) {
security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED;
}
capabilities = 0;
if (lp_host_msdfs()) {
capabilities |= SMB2_CAP_DFS;
}
if ((protocol >= PROTOCOL_SMB2_24) &&
(lp_smb_encrypt(-1) != SMB_SIGNING_OFF))
{
if (in_capabilities & SMB2_CAP_ENCRYPTION) {
capabilities |= SMB2_CAP_ENCRYPTION;
}
}
/*
* 0x10000 (65536) is the maximum allowed message size
* for SMB 2.0
*/
max_limit = 0x10000;
if (protocol >= PROTOCOL_SMB2_10) {
int p = 0;
if (tsocket_address_is_inet(req->sconn->local_address, "ip")) {
p = tsocket_address_inet_port(req->sconn->local_address);
}
/* largeMTU is not supported over NBT (tcp port 139) */
if (p != NBT_SMB_PORT) {
capabilities |= SMB2_CAP_LARGE_MTU;
req->sconn->smb2.supports_multicredit = true;
/* SMB >= 2.1 has 1 MB of allowed size */
max_limit = 0x100000; /* 1MB */
}
}
/*
* the defaults are 1MB, but we'll limit this to max_limit based on
* the dialect (64kb for SMB2.0, 1MB for SMB2.1 with LargeMTU)
*
* user configured values exceeding the limits will be overwritten,
* only smaller values will be accepted
*/
max_trans = MIN(max_limit, lp_smb2_max_trans());
max_read = MIN(max_limit, lp_smb2_max_read());
max_write = MIN(max_limit, lp_smb2_max_write());
security_offset = SMB2_HDR_BODY + 0x40;
#if 1
/* Try SPNEGO auth... */
security_buffer = data_blob_const(negprot_spnego_blob.data + 16,
negprot_spnego_blob.length - 16);
#else
/* for now we want raw NTLMSSP */
security_buffer = data_blob_const(NULL, 0);
#endif
out_guid_blob = data_blob_const(negprot_spnego_blob.data, 16);
status = GUID_from_ndr_blob(&out_guid_blob, &out_guid);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
outbody = data_blob_talloc(req->out.vector, NULL, 0x40);
if (outbody.data == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
SSVAL(outbody.data, 0x00, 0x40 + 1); /* struct size */
SSVAL(outbody.data, 0x02,
security_mode); /* security mode */
SSVAL(outbody.data, 0x04, dialect); /* dialect revision */
SSVAL(outbody.data, 0x06, 0); /* reserved */
memcpy(outbody.data + 0x08,
out_guid_blob.data, 16); /* server guid */
SIVAL(outbody.data, 0x18,
capabilities); /* capabilities */
SIVAL(outbody.data, 0x1C, max_trans); /* max transact size */
SIVAL(outbody.data, 0x20, max_read); /* max read size */
SIVAL(outbody.data, 0x24, max_write); /* max write size */
SBVAL(outbody.data, 0x28, now); /* system time */
SBVAL(outbody.data, 0x30, 0); /* server start time */
SSVAL(outbody.data, 0x38,
security_offset); /* security buffer offset */
SSVAL(outbody.data, 0x3A,
security_buffer.length); /* security buffer length */
SIVAL(outbody.data, 0x3C, 0); /* reserved */
outdyn = security_buffer;
req->sconn->using_smb2 = true;
if (dialect != SMB2_DIALECT_REVISION_2FF) {
struct smbXsrv_connection *conn = req->sconn->conn;
status = smbXsrv_connection_init_tables(conn, protocol);
if (!NT_STATUS_IS_OK(status)) {
return smbd_smb2_request_error(req, status);
}
conn->smb2.client.capabilities = in_capabilities;
conn->smb2.client.security_mode = in_security_mode;
conn->smb2.client.guid = in_guid;
conn->smb2.client.num_dialects = dialect_count;
conn->smb2.client.dialects = talloc_array(conn,
uint16_t,
dialect_count);
if (conn->smb2.client.dialects == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
for (c=0; c < dialect_count; c++) {
conn->smb2.client.dialects[c] = SVAL(indyn, c*2);
}
conn->smb2.server.capabilities = capabilities;
conn->smb2.server.security_mode = security_mode;
conn->smb2.server.guid = out_guid;
conn->smb2.server.dialect = dialect;
conn->smb2.server.max_trans = max_trans;
conn->smb2.server.max_read = max_read;
conn->smb2.server.max_write = max_write;
req->sconn->smb2.max_trans = max_trans;
req->sconn->smb2.max_read = max_read;
req->sconn->smb2.max_write = max_write;
}
return smbd_smb2_request_done(req, outbody, &outdyn);
}